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Friday, October 12, 2018

DevOps is rapidly transform in last few years, There was
a time when people used to code on VB 6 to create EXE that will used on
Win XP to check if .NET framework is installed, Now a days we travel from
.NET 1.0 to 4.5.x and Now .NET Core.

.NET structure, CLR, MSIL has changed a lot over years,
.NET is not limited to only Windows or specific version of OS, it has
improved a lot and supporting modern features like Cross platform, Microservices, Docker
container, Mobility, Cloud computing and reliability, But
the question remain same, When to choose .NET Framework and When
to choose .NET Core, Lets walk through this article, it will help you to
choose between .NET Framework and .Net Core for server Apps.

Preparation

If you want to develop web based applications/web apps
then there exist two strong foundations from which you can either use .NET
framework or .NET Core, No doubt, both are having many similar components but
there exist some fundamentals difference too. Depending on your requirement and
nature of application you can choose either of them.

When to choose .NET Framework

The one-liner answer for this question is "You need
to choose it, when .NET Core not able to replace .NET framework in all server
applications and its related component"

1.If you are having
existing application in .NET framework and want to develop some new part
in .NET Core then Don't try it, instead of Using .NET Core,
just create a separate addon (in .NET Core) and call it from .NET
Framework (e.g. Microservices using .NET Core)

2.There are much chances
that you are using any 3rd Party DLL which is in .NET framework but not available
in .NET Core, then you should go with .NET framework only

3.If there are any .NET
framework technologies that are not available in .NET Core then do not go for
.NET Core, Here is the list of .NET framework common technologies that are not available
in .NET Core

1.WCF Services
implementation : You cannot consume WCF services from ASP.NET Core, but may be
in the future they will consider it.

2.WWF (Windows
work flow foundation) is also not available in .NET Core.

3.ASP.NET Webforms :
There are no web forms exist in .NET Core and might be there is no future plan
too.

4.Limited
Languages support : VB (Visual Basic) and F# are currently there in .NET
Core but not supported by all project types.

5.ASP.NET Web pages are
also example of it.

But Microsoft are working on those things and trying to
fetch as many things in .NET Core as they can, you can check the list here

When to choose .NET Core

This is the brand new .NET technology with different base
structure than .NET, no doubt, it is not having that much classes
and libraries that support in .NET framework, but it is faster
and modular than .NET Framework

1.If you want to run
your application on multiple platforms then you can go with it, .Net
Core supports all popular platforms like Windows, Mac, Linux, Cross
platform is the biggest advantage of .NET Core

2.If you want to develop application
on MACOs or Linux then you can go with .NET Core, as you can do it
using Visual Studio code (Which is open source and free, visit Code.Visualstudio.com for
more details) , Additionally there are some third party editors available for
it.

3.When you want to use
Microservices then you can choose .NET Core. (In Micro services we break down
large project in smaller independent runnable modules, these modules are
communicated with each other via API calling) This will also help us to mix
different technologies in single project (Like we can mix Java, ruby, .NET
Framework)

4.You can use .NET Core,
when you need scalability with good performance. .NET core is faster than .NET
framework, it helps to reduced server and VM cost, it loads with
minimum set of libraries that are really needed.

5..NET Core has seamless
support to Containers, .NET Core can be used with
different design patterns and microservices. ASP.NET Core is cross
platform it is much easier to deploy docker containers in .NET Core than
in .NET framework.

6..NET Core allows you
to installed different version of .NET Core on same machine, so that you can
run .NET Core application side by side that targeted to their specific
installed .NET Core versions

Finally

Developers are very curious about learning
and implementing .NET Core but there are some pros and cons to it.
If you are running large enterprise application that built on .NET
Framework do not try to migrate it, Consider your requirement first
and then proceed.

Technologies are introduced and enhanced to overcome
earlier technology problems, but some where we need decide to move on or
not. Here time, cost, resources and need are the four
factors affecting to take this decision. Finally it's your choice that
what you want to accomplish

Friday, March 23, 2018

History

Last year my friend has deployed his own website on internet and tries to search on Google/yahoo and other search engines but they are unable to enlist the website in it, even Google failed to show the name of his website in auto complete/suggestion textbox too. Everyone wants to see their website name on first search page of Google/yahoo/other search engines when they search.But it needs some technique that should be apply and used for each webpage that we have deployed on internet.This technique is known as Search Engine Optimisation. (in simple words, Help search engine to search the things quickly by applying some simple rules on your web pages)

Introduction

Search engines are the heart of the internet. we know there are zillions websites available on internet and still increasing day by day, In such a case search engine plays a very important role to search any content/pages on this ocean.SEO optimization is not a single cup of tea, it needs a optimization of WebPages and follow different rules while generating them. In my previous article i have explain some of the SEO tips, you may check this article on this linkBy following SEO tips it will improve sites' interaction of both users and search engines. This article does not give a magic pill that can show your website always on top page of search engine, but this article tell you about the best practicesthat outlined below and will make it easier for search engines to crawl, index and understand your content.

Start with Optimization tips

Every year search make changes in their way of working and try to optimize the search patterns, your site needs to update as well to persist in this race. Contents are the most important of your web-page, the contents are the things that collects new users/visitors for you, that make your site/web-page popular, while following SEO tips modifying content with good keywords is most essentialPageTitle- The start of search engine lifeThe most important part of search engine is Page-title. Search engine begin the search from here only. Your application/website should have good accurate page title. By using title user and search engine should know "what the topic of a particular page is"

Many times i have seen there is no page title for many Web-pages. Avoid doing that, add Page title to each pages, the Page title should be present under 'HEAD' section of page. When user search any 'term' in Google then if the searched 'term' is exist in title then it will displayed as BOLD in Google search result. Most of the time the Google suggestion list is picked from Page title itself.see below snap

Points to Note

- Search engine optimization affects only organic search results, not paid or "sponsored" results such as Google Ad Words.Now the question is, what is Paid/sponsored ad words and what is organic searchThe search result highlighted with some light color and appear at the top the search page is called as 'Paid/sponsored ad words', and the rest of search result is come under 'Organic Search' resultBelow snap will clear your idea

How search engine works

When search engine find the pages in whole web ocean, Search engine works with the help of the page elements itself, it consider following things while searching.

Proper Title of the page which helps people to know more about your article without opening it, we have seen if your title is proper and useful then search engine like Google show them in BOLD in top of the page

Keywords that are used in page. The keywords are the words that are put by the user in search engine criteria for searching, so our website should contain proper and popular keywords. Frequency and location of keywords is most important in Web page.

Do not try to include 'FAKE' keywords in your website that are not related to your web content otherwise your website may be BLACK listed by search engine. If the keyword only appears once within the body of a page, it will receive a low score for that keyword.

You should use your main keyword for each page in the file name, preferably at the beginning of the first sentence.

Links used in page are played important role in searching. Search engine uses 'crawing and indexing' like algorithms for link search, it follows the link and check for the rating of linked page.

Broken link, spam link may decrease your website ratings, Google like search engine looks at how many Web pages link to a particular site to determine its relevance

Uniqueness of the content is also a noticed by search engine and proper use of Meta tags is also important.

One of the noticeable aspect is "How long the Web page has existed on web?", The age of the page is also considered while searching. People create new Web pages every day, and not all of them stick around for long, Google link search engines places more value on pages with an established history.

Below snap show you how Google locate a title in possible list

Google like search engine take use of automated robots for searching like "crawlers" or "spiders", with the help of them it can reach to many billions of interconnected documents. Currently, the major engines typically interpret importance as popularity.The more popular a site, page or document, the more your rating is. Here in this case search engines have continued to increase users’ satisfaction by using metrics that interpret popularity.

Make our pages popular

While designing content of the page you should keep a thing in mind that, pages should primarily designed for users, not for search engines.

Don't be dishonest with your users or present them different content that are used for search optimization, this is commonly referred to as cloaking.

While you make website you should make a clear hierarchy of text and links. Every page should be reachable from at least one static text link.

Friday, March 9, 2018

In this article I have explained, When to use ASP.NET Webforms and ASP.NET MVC. We know what is ASP.NET and what is ASP.NET MVC, but we are confused when to favor which technologyLast week my friend has started a new web based project in .NET, he asked me In which technology he should go ASP.NET or ASP.NET MVC ? Now a days everyone talk about ASP.NET and ASP.NET MVC but if we asked them, when to favor which technology ? all goes confused. There is no clear-cut answer, and rightly so. This article will help you to choose between ASP.NET and MVC depend upon your requirement and tell you Advantages / Disadvantages of ASP.NET MVC. Lets start with it.

ASP.NET:

Basically ASP.NET was developed to improve the speed and performance of classic ASP, Microsoft's ASP.NET, one of the most successful web application development frameworks ever.You can use ASP.NET to fast develop and deploy highly scalable, high-performance web applications in a managed environment

When to use ASP.NET

1. RAD – Rapid Application Development

RAD is the strong point of ASP.NET, ASP.NET does not deal with HTML markup directly, rather it gives set of powerful tools to developer to design and develop web application, compiler then convert it to Markup and show it on web application, so developer does have to take care of internal architecture and can develop application rapidly.

2. Cost

When Cost is matter ASP.NET is really helpful to you. As it is bit old technology and start of the web development phase, maximum developer community is aware of it and develop using ASP.NET, where as MVC is newer than comparing with ASP.NET, so there is cost incurred to development with ASP.NET MVC

3. Stable implementation

ASP.NET Web Forms implementation is now a stable and robust with many years of deployment experience. over the year ASP.NET is upgraded and is now more firm and dependable.

Drawbacks/Limitation of ASP.NET

Customization is not possible and easy with built in ASP.NET control set.

As ASP.NET create its own markup tags while rendering on browsers which is very much different than actual HTML tags so flexibility among cross browser compatibility and devices are less

The generation of each control ID is vary framework to framework, which needs to make changes in scripting as well.

maintaining data between post back is additional task for ASP.NET, as it's page life cycle is depend upon ViewState

Final web page render size is also an issue for ASP.NET as view state increase each page size.

ASPX pages has fixed URL render pattern which will slow down SEO and search engine crawling.

ASPX page does not render without its code behind, so there is additional load on web page each time

ASP.NET MVC

I have read somewhere, "MVC framework is not efficient unless you're willing to roll up your sleeves and build your own project specific infrastructure ", I think it is really true, MVC is complex for Oldies and Simple for New projects, ASP.NET MVC is support Test-driven development (TDD) . I have discuss some points about ASP.NET MVC below. which includes When to favor, Advantages and limitations.

When to use ASP.NET MVC

ASP.NET MVC has very scatter structure so code separation is strong point, No doubt ASP.NET MVC has many great features like Bundling, minification, Parallel Development, Test-driven development ( It actually leads to very short development life cycle), Web API (for building HTTP service), URL Routing Scaffolding.
But there are some facts and things that we need to consider before using ASP.NET MVC, so lets consider some priorities while going with ASP.NET MVC

1. Complex form structure

ASP.NET MVC has more hold on HTML so When you want to develop a complex form structure, you can use it, MVC allows for any number of forms on the page

2. Purpose of website is for public

If you are build website or web application targeting to public like banking or reservation then you need to go for MVC as it has very SEO friendly and lightweight.

3. Separation of concerns

When your concern is code separation you can go for MVC as it has very scattered structure with Model, View and controller, here is very less chances of getting things more complex.

4. Different view device wise

If you are targeting you development towards multiple render devices then go for MVC it offer design flexibility so that same web page can be easily render on desktop browser, mobile and smart phone devices in simple render mode

5. Easy Unit testing

As with the help of MVC we can developed loosely coupled application, it is very easy to test each module independently, Dependency Injection is more useful in such cases

6. Easily blend with other technology

ASP.NET MVC has capacity to easily blend with other technology, jQuery and other JavaScript frameworks can be simply add in ASP.NET MVC

7. Automatic Unit Testing

If you want to go for automatic unit testing then ASP.NET MVC is good for you.

Drawbacks and limitation of ASP.NET MVC

- It is not easy to understand and code, within limited time frame
- ASP.NET structure is very much different from MVC it is Difficult to convert an existing site from ASP.NET to ASP.NET MVC.

Facts of life

More often practical conditions are not same as hypothec conditions the choice between ASP.NET and ASP.NET MVC is not a single cup of tea, it is vary from project to project and team to team

If you have very large ASP.NET project then do not go for MVC as it is like to build your project from scratch, it may be leads to time and cost wasting

If you want to deploy project targeting more user volume and devices then go with MVC

Friendly URL's for SEO with no viewstate and cleaner HTML is the powerful point which leads MVC to perform faster

Finally, There are Pros and Cons for both ASP.NET and ASP.NET MVC, This article is small attempt to put focus on features point. It helps you to take decision easy between these two. But the final Answer is remain same "it depends".

Tuesday, February 13, 2018

Find out who Delete your data from SQL table

Have you lost your data from SQL table ? Have you lost your SQL table ? want to know who ran DELETE or DROP Query on your database ? Then go through this step by step article, it will help you to find the culprit

Introduction

Last month my friend has called me and said, some has delete his important data from SQL table and now no one confess it. He asked me to search a way to find culprit. After couple of here and there i got a way and now want to share with you. So, let's enjoy this article.

This article will help you find the user who fire DELETE or DROP statement on your table or database

LDF :
(Those who don't know what is LDF) LDF is a file extension for log data files these files are exist with MDF files (which contains actual data). LDF file store all transactions with time stamp and help to recover database in case of data loss.

Now, to read LDF file we need to use 'fn_dblog' function, (which is undocumented function of SQL), after executing this function on particular database you will able to see live transaction logs and operations executed on that database.

Let's create sample database and table, with the help of following Query

Track DELETE Activity

Now, just go and delete all rows from database, use below simple query

Deletefrom Emp

Our Emp table is now empty as, we have delete all the queries

Let's examine the log table, having operation type is 'LOP_DELETE_ROWS', fire fn_dblob function again and see what you get

select*from fn_dblog(null,null) whereOperation='LOP_DELETE_ROWS'

Result:

Above result pane show us, all the transaction rows which are having 'DELETE' entries on specific database table, you need to search for the your 'specific' table (from where you have lost your data), check out column 'AllocUnitName', this column contains your table name on which 'DELETE' statement has fired.

In our case, Table name is 'Emp', now get the transaction ID for that particular 'table' entry record, execute below query to get record of particular table

Same as DELETE scenario execute below query on master database, as per our result Hexadecimal string is 0x01

SELECT SUSER_SNAME(0x01)

which is the same user 'sa'

So, to conclude

SQL store all its transactions in log table, we can read transaction log file using fn_dblob function, we can do more research on each transaction with the help of this function. All transactions are logged with different operations, With the help of SUSER_SNAME function we can easily trace out encrypted user name.

In my next article i will cover deep dive points on 'Reading Transaction Log of SQL (LDF)', so Please stay tuned

and Enjoy this article
**DO NOT alter enties of fn_dblog or DO NOT run these command on production unless you have backup.

Tuesday, November 14, 2017

In this article i explained you to Fix SQL error occurred while establishing a connection to remote computer, so we can say we can resolve error "Network-related or instance-specific error occurred while establishing a connection to SQL Server [2005/2008/2012]"

Background

Couple of years back when i was not much familier with SQL, i try to connect to my SQL Server from my client. I put servername and try to login with SQL Server authentication with user name and password and i got error "A network-related or instance-specific error occurred while establishing a connection to SQL Server...", after spending couple of hours on it i was able to get rid of it, this article is for those who got same error and still they are put their head in SQL to resolve the issue.

Introduction

Many times we are trying to connect to SQL server with SQL management studio either by express version or by enterprise version and we got following error"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) "Above error is really headache for sql users.Here is the snap of error

Fix it

To fix the issue we might need to do some configuration changes in SQL management studio (Here i use SQL 2008 for it)

This is the basic and simple check it may resolve your error, if not then continue with this article

Enable TCP/IP protocolNext step is the enable the TCP/IP, just navigate to 'the SQL Server Configuration Manager' -> in left pane Open 'SQL server network configuration' -> select protocol for SQLEXPRESS in right pane select TCP/IP and make it 'enable'see below snap

This is one of the helpful step and resolve many users issue, if the problem still continues then continue with this article

Handle Firewall portMany times your firewall security settings does not allow SQL to pass through, you need to handle that firewall port to work with SQL stuff. To allow in firewall there need to configure couple of settings 1. set 1433 port in TCP/IP proerpties2. set Inbound and Outbound rules in windows firewall settings (Applicable for window 7 and above operating system)

set TCP port 1433 in configuration window as below snap shows

Now to set Inbound and Outbound rule we need to navigate to windows firewall, Just Open the Control Panel and navigate to Windows Firewall.Click on Advanced Settings on the left hand side and you should see the Windows Firewall with Advanced Security. Select the Inboud Rules on the left hand side and click on New Rule… on the right hand side.go through the following snap sequence it will help you to enable and set the windows firewall settingsOpen 'windows firewall with advanced security' screen, select 'Inbound Rule' and click on 'New Rule', see below snap

New Inbound wizard screen' will open, Now in left hand side of the window select 'Rule Types', in right hand side select 'Port' now click 'Next'

In protocol and ports section select 'specific local ports' and give port number as '1433' (default sql port), now click 'Next'

In action section, select 'Allow the connection', and click on Next

In Name section give name and description of the rule, which help us to identify the rule in firewall, now click on Finish

Yes, we are almost done with the settings now close SQL server and restart it again and try to connect, it will resolve your issue.

Summing up

Above error is very basic Many time occur due to different conditions, if you have database installed on SQL 2008 and if you try to connect it with SQL 2005 management console then also same error occurred, when you have install a new instance of SQL server on machine then also this error arise, above are some settings that help you to get rid of the error

Monday, August 7, 2017

Introduction

C# 7.0 is planned to release in parts, Microsoft has release Most of its features with Visual Studio “15” Preview 4, it was release in last month (Aug 2016), See Release Post
Code simplification and improve performance are the main key role of this build, Tuples, Pattern matching are some of the really good features introduced. Hope you will enjoy these features and be more productive.
Let's see new features of C# 7.0

1. Tuples (with types and literals)

Return multiple values from a method is now a common practice, we generally use custom datatype, out parameters, Dynamic return type or a tuple object but here C# 7.0 brings tuple types and tuple literals for you it just return multiple values/ multiple type inform of tuple object. see below snippet

Tuples are very useful thing where you can replace hash table or dictionary easily, even you can return multiple values for a single key, Additionally you can use it instead of List where you store multiple values at single position.
.NET also has a Tuple type (See here) but it is a reference type and that leads to performance issue, but C# 7.0 bring a Tuple with value type which is faster in performance and a mutable type.

Deconstruction

Most of the time we don't want to access whole tuple bundle or we just need internal values then we can use Deconstruction features of C# 7.0, we can easily de-construct a tuple and fetch values that we need, following snippet will clear your doubt

2. Record Type

C# support record type, which is nothing but a container of a properties and variables, most of the time classes are full with properties and variables, we need lot of code to just declare them but with the help of Record Type you can reduce your effort, see below snippet

That's it and we have Done !
above snippet produce same output as earlier snippet.

3. Minimizing OUT

Out parameter is very popular when we want to return multiple values from method, By nature out parameters are ref type and works as an argument, we can use it easily but the only condition is out variable should be initialized before it passed. see below snippet

4. Non-'NULL' able reference type

Null reference is really a headache for all programmers, it is a million dollar exception. If you don't check them you got runtime exception or if you check them for each object then your code goes long and long, To deal with this problem C# 7.0 come with non-nullable reference types
**I think syntax for it yet not fixed still they have release following syntax
'?' is for nullable value-type and '!' is for non-nullable reference type

MyClass objNullRef; //Nullable reference typeMyClass! objNotNullRef; //Non-nullable reference type
objNullRef =null; // this is nullable, so no problem in assigning
objNotNullRef =null; //Error, as objNotNullRef is non-nullable
objNotNullRef = objNullRef; //Error, as nullable object can not be refered
WriteLine(objNotNullRef.ToString()); //Notnull so can convert to tostring
WriteLine(objNullRef.ToString()); // could be nullif (objNullRef !=null) { WriteLine(objNullRef.ToString); } //Noerror as we have already checked it
WriteLine(objNullRef!.Length); //Noerror

5. Local Methods/Functions

Local methods and functions is already there in current version of C# (Yes, we can achieve them using Func and Action types, see here Func and Action), but still there are some limitations to local method, we can not have following features in it

in above snippet we have define 'LocalFunction' as local function which is inside Main Function 'Main', here we can use out or ref in it.

6. Readability Improvement with Literals

Many times we use literals in code, if they are too long then we might loose Readability, to sort out such issues C# 7.0 comes with some improvement in Literals. Now C# allows '_' (underscore) in Literals for betterment of understand, it does not effect on its value. see below snippet

**Literals are nothing but a constant value (hard-coded value) which may be with predefined meaning. (Litearls in C#)

7. Pattern matching

C# 7.0 allows user to use pattern in IS statement and with SWITCH statement, so we can match pattern with any datatype, patterns can be constant patterns, Type patterns, Var patterns. following sample snippet will clear your concepts, let's start with IS pattern

8. 'return' by Ref

Have you tried to return your variable from method/function as Ref ? Yes, C# 7.0 allows you to do that. Infect you can pass a variable with Ref return them as Ref and also store them as Ref, isn't it amazing.
see below snippet

In above sample we have find and replace a string, by return a Ref from method.9. Throw Exception from Expression
You read it right, in C# 7.0 Now you can throw exception from your expression directly. see below snippet

MVP [ASP.NET/IIS]

About Me

I am prasad, Very passionate about Microsoft .NET technology. I like to write an articles on different .NET aspects and like to help Developers, to resolve their issues and boost them on Microsoft Technologies.